Analysis of radiation pressure effects in pulsating stars through perturbative limit cycle solutions

1991 ◽  
Vol 373 ◽  
pp. 237 ◽  
Author(s):  
A. Costa ◽  
D. Gomez ◽  
C. Ferro Fontan
Keyword(s):  
Limit Cycle ◽  
Radiation Pressure ◽  
Pressure Effects ◽  
Pulsating Stars ◽  
Perturbative Limit

Radiation-pressure effects upon a micromirror in a high-finesse optical cavity

2008 ◽  
Author(s):  
A. Heidmann ◽  
O. Arcizet ◽  
C. Molinelli ◽  
T. Briant ◽  
P.-F. Cohadon
Keyword(s):  
Radiation Pressure ◽  
Optical Cavity ◽  
Pressure Effects ◽  
High Finesse

scholarly journals The role of radiation pressure in LBV atmospheres

1989 ◽  
Vol 113 ◽  
pp. 195-204
Author(s):  
I. Appenzeller
Keyword(s):  
Mass Loss ◽  
Radiation Pressure ◽  
Large Amplitude ◽  
Pressure Effects ◽  
Radiative Acceleration

AbstractAs LBVs have luminosities close to their Eddington limits, their structure is profoundly influenced by radiation pressure. Radiation pressure effects probably cause the highly extended atmospheres and the extreme mass loss observed during the maximum states of the S Dor variables. An opacity-related instability of the radiative acceleration combined with a delayed thermal readjustement of the sub-atmospheric layers possibly explains the large-amplitude radius variations of these objects.

Minimization of Solar Radiation Pressure Effects for Gravity-Gradient Stabilized Satellites

1966 ◽  
Vol 88 (2) ◽  
pp. 444-450 ◽  
Author(s):  
R. J. McElvain ◽  
L. Schwartz
Keyword(s):  
Solar Radiation ◽  
Radiation Pressure ◽  
External Disturbance ◽  
Solar Radiation Pressure ◽  
Pressure Effects ◽  
Gravity Gradient ◽  
Physical Parameters ◽  
Multiple Reflections ◽  
Minimization Procedure ◽  
Vehicle Configuration

The considerations necessary for minimization of solar radiation pressure effects for gravity-gradient stabilized vehicles are presented here. Owing to the rather weak restoring forces available for gravity-gradient stabilized vehicles, solar pressure torques represent a prime source of attitude errors unless steps are taken to minimize their effects. The solar torque minimization procedure generally consists of four distinct steps for a given vehicle configuration: (a) Derivation of the solar torque expressions for the characteristic vehicle configuration, including such effects as diffuse reflection, multiple reflections, and so on; (b) identification of the relative contribution of the solar torques on the various surfaces, and facilitation of solar torque minimization by balancing torque contributions of similar time variation and opposite sign against one another; (c) minimization of the torque about the vehicle axis with the weakest restoring torque (usually the local vertical) via optimization of reflectance characteristics and other physical parameters (using a steepest descent or similar approach); and (d) determination of the vehicle attitude response for the nominal configuration and reflectances, suggesting any configurational changes which might reduce peak attitude errors if necessary. The minimization procedure is performed in this paper using the NASA / Hughes Applications Technology Satellite (ATS) as a prime example of a gravity-gradient-stabilized satellite in an environment where solar pressure is the predominant external disturbance. The application of the solar balancing techniques to the ATS configuration resulted in peak yaw torques of less than 1 dyne-cm for the synchronous altitude satellite, and corresponding peak attitude errors of less than 1 deg in all axes due to solar pressure torques. Although the torque minimization procedures presented here are applicable in the general sense, the application of the techniques to a specific configuration requires derivation of the solar torque expressions for that particular configuration; therefore, the torque minimization example for the NASA/Hughes ATS vehicle can serve as a guide for other configuration applications.

scholarly journals Total absorption of unpolarized radiation in a stratified plasma

1988 ◽  
Vol 6 (2) ◽  
pp. 255-264
Author(s):  
S. Vukovic ◽  
R. Dragila ◽  
A. M. Smith
Keyword(s):  
Radiation Pressure ◽  
Density Profile ◽  
Monochromatic Light ◽  
Radiation Energy ◽  
Pressure Effects ◽  
Angle Of Incidence ◽  
Total Absorption ◽  
Plasma Structure ◽  
Simultaneous Excitation ◽  
Unpolarized Radiation

We demonstrate that 100% absorption of an unpolarized monochromatic light can be achieved in a plasma with a density profile characterized by a presence of a cavity and a steep density gradient across the critical region. These profiles can occur in a laser produced plasma due to the radiation pressure effects. The conditions were found when both s- and p -polarizations of the electromagnetic radiation which is obliquely incident upon a stratified plasma are totally absorbed at same angle of incidence. The effect is due to simultaneous excitation of surface and guided modes which are eigenmodes of the considered plasma structure. When these modes are excited some additional conditions must be satisfied which allow for full compensations of all dissipative processes by the radiation energy inflow.

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